Semi-Duplex Private Call Also called Private Call or Express Connect Call. In this type of one-way call, the user
presses and holds the PTT while talking, and releases the PTT while listening.
See also: Private Call, Push-to-Talk
Sensitive Data A set of important and unique, factory-defined values (such as frequency tuning) assigned to radios.
Short Data Service (SDS) A flexible bearer service that transfers information from one interface to another.
Short Subscriber Identity (SSI) The network specific portion of a TETRA Subscriber Identity. An SSI is only
unique within one TETRA subdomain (one TETRA network).
SIM Subscriber Identity Module
Software Image A collection of files distinguished by individual releases. It contains firmware, codeplug, and audio
template files dedicated to specific radio models.
SSI Short Subscriber Identity
Static Cipher Key (SCK) Key used for encryption between radios and BTS in Class 2 systems with corresponding
algorithm.
See also: Encryption
Status ID A feature that makes it possible for a subscriber to send status messages to other subscribers. The user can
enter a status message for each ID in a Status ID list. When a subscriber sends a status message, the ID of the subscriber?s
unit is sent along with the status message.
Subscriber Identity Module (SIM) A smart card that holds subscriber information (including the authentication
key) and is inserted into the radio to grant its personality.
Switching and Management Infrastructure (SwMI) All the system components excluding the mobile
equipment that is the CNE and all the remote site equipment.
See also: Central Network Equipment
SwMI Switching and Management Infrastructure
Talkgroup A group of radio users that can share calls and messages as a group. Normally a talkgroup is comprised of
users who have a need to communicate with each other on a day-to-day basis.
TEI TETRA Equipment Identity
Telephone Interconnect (TI) A call feature that provides subscriber access to the Public Switched Telephone
Network (PSTN). Telephone interconnect can be used for both land-to-mobile calls and mobile-to-land calls.
See also: Public Switched Telephone Network
TETRA Acronym for TErrestrial Trunked RAdio. The digital trunked radio standard produced by ETSI providing detailed
telecommunications specifications to which Base Stations and radios should adhere.
See also: Base Station, European Telecommunications Standards Institute, Radio
TETRA Equipment Identity (TEI) An electronic serial number that is permanently embedded in the TETRA
equipment, like radios.
TI Telephone Interconnect
104 | Glossary
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